Patent Application
20240119913
This application claims priority to Chinese Patent Application No. 202211237916, filed on Oct. 10, 2022, the entire disclosure of which is incorporated herein by reference.
The present disclosure relates to a field of display technologies, and particularly relates to a gate driving circuit and a display panel.
In gate driving circuits, an output terminal of a first transistor is generally connected to a control terminal of a second transistor to drive the second transistor to be turned on or off. However, due to a parasitic capacitance between a gate electrode of the second transistor and an output terminal of the second transistor, an potential of the output terminal of the first transistor, that is, a gate potential of the second transistor, will cause a coupling effect to a potential of the output terminal of the second transistor, thus affecting stability of the potential of the output terminal of the second transistor, and further affecting working stability or reliability of the gate driving circuit.
The present disclosure provides a gate driving circuit and a display panel to relieve a technical problem of low working reliability of the gate driving circuit.
In a first aspect, a gate driving circuit is provided. The gate driving circuit includes a plurality of gate driving units, and each of the gate driving units includes a first transistor and a second transistor. One of a source electrode and a drain electrode of the first transistor is connected to a first transmission line, and a gate electrode of the first transistor is connected to a first control line. A gate electrode of the second transistor is connected to another one of the source electrode and the drain electrode of the first transistor, one of a source electrode and a drain electrode of the second transistor is connected to a second transmission line, and another one of the source electrode and the drain electrode of the second transistor is connected to an output line, wherein a first size of the first transistor is less than a second size of the second transistor.
In some embodiments, the second size is greater than or equal to 1.05 times the first size, and is less than or equal to 1.25 times the first size.
In some embodiments, the second size is equal to 1.1 times the first size.
In some embodiments, the output line is a cascade line or a scan line.
In some embodiments, each of the gate driving units further includes a third transistor, a gate electrode of the third transistor is connected to the another one of the source electrode and the drain electrode of the first transistor, one of a source electrode and a drain electrode of the third transistor is connected to the second transmission line, and another one of the source electrode and the drain electrode of the third transistor is connected to the cascade line or the scan line, wherein a third size of the third transistor is greater than the first size of the first transistor.
In some embodiments, the third size is greater than or equal to 1.05 times the first size, and is less than or equal to 1.25 times the first size.
In some embodiments, the third size is equal to 1.1 times the first size.
In some embodiments, the another one of the source electrode and the drain electrode of the second transistor is connected to the cascade line, the another one of the source electrode and the drain electrode of the third transistor is connected to the scan line, and the third size is greater than the second size.
In some embodiments, the output line is configured to transmit an output signal, the output signal comprises a first potential and a second potential, the first potential is higher than the second potential, and a gate potential of the second transistor in a conduction state is higher than the first potential.
In a second aspect, a display panel is provided, and the display panel includes a gate driving circuit in at least one of the above embodiments.
In the gate driving circuit and the display panel of the present disclosure, by setting the second size of the second transistor to be greater than the first size of the first transistor, compared with the first size of the first transistor, the second size of the second transistor is increased, which not only improves the working stability of the second transistor itself, but also limits the transmission performance of the first transistor through the first size, so as to reduce or avoid the coupling of a potential of an output terminal of the first transistor to a potential of an output terminal of the second transistor. And it is beneficial to stabilize the potential of the output terminal of the second transistor, thereby improving the working stability or reliability of the gate driving circuit.
Technical solutions and other beneficial effects of the present disclosure will be apparent through the detailed description of the specific embodiments of the present disclosure in conjunction with the accompanying drawings.
The technical solutions in the embodiments of the present disclosure will be described clearly and completely hereafter with reference to the accompanying drawings. Apparently, the described embodiments are only a part of but not all embodiments of the present disclosure. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
In view of the technical problem of a low working reliability of the gate driving circuit mentioned above, a gate driving circuit is provided in the embodiment. Referring to
It can be understood that, in the gate driving circuit, by setting the second size of the second transistor 122 to be greater than the first size of the first transistor T11, compared with the first size of the first transistor T11, the second size of the second transistor T22 is increased. Thus, not only the working stability of the second transistor T22 is improved, but also the transmission performance of the first transistor T11 can be limited through the first size, so as to reduce or avoid the coupling of a potential of an output terminal of the first transistor T11 to a potential of an output terminal of the second transistor T22. And it is beneficial to stabilize the potential of the output terminal of the second transistor 122, thereby improving the working stability or reliability of the gate driving circuit.
In an embodiment, the output line 14 is a cascade line 141 or a scan line 142.
It should be noted that, whether the another one of the source electrode and the drain electrode of the second transistor T22 is connected to the cascade line 141 or is connected to the scan line 142, the working stability of the gate driving circuit can be improved.
It should be noted that, the output line 14 may be a cascade line 141 or a scan line 142. Wherein the cascade line 141 is configured to transmit an Nth level cascade signal ST(N), and the scan line 142 is configured to transmit an Nth level scan signal G(N).
The first transmission line 11 can be configured to transmit a first transmission signal, and the first transmission signal may be a direct current signal or a square wave signal. The square wave signal may be one of other scan signals whose phases are earlier than a phase of the Nth level scan signal G(N) in one frame. Such as an N−1th level scan signal, a N−6th level scan signal G(N−6), or an N−9th level scan signal . . . etc. Among them, waveforms of different level scan signals are same, and phases of the different level scan signals are different.
The first control line 12 can be configured to transmit a first control signal, and the first control line 12 may also be a square wave signal. The square wave signal may be one of other cascade signals whose phases are earlier than a phase of the Nth level cascade signal ST(N) in one frame. Such as an N−1th level cascade signal, an N−6th level cascade signal ST(N−6), or an N−9th level cascade signal . . . etc. Among them, waveforms of different level cascade signals are same, and phases of the different level scan signals are different.
The second transmission line 13 can be configured to transmit a second transmission signal, the second transmission signal may be a direct current signal or a clock signal, and the clock signal may specifically be an Nth level clock signal CK(N). Among them, waveforms of different level clock signals are same, and phases of the different level clock signals are different.
In an embodiment, the second size is greater than or equal to 1.05 times the first size, and is less than or equal to 1.25 times the first size.
It should be noted that, a proportional relationship is configured between the first size and the second size in the embodiment, which can minimize an adverse effect on a potential of an output terminal of the second transistor T22 with an appropriate size. Not only an occupied space of the gate driving circuit is reduced, but also the stability of the gate driving circuit is improved.
Wherein by increasing the second size of the second transistor T22, a positional relationship between the gate electrode and the output terminal of the second transistor T22 can be configured more flexibly, and the output terminal is the source electrode and the drain electrode. For example, a smaller overlapping area between the gate electrode of the second transistor T22 and the source electrode or the drain electrode of the second transistor T22 can be configured in a thickness direction of the gate driving circuit, and even the smaller overlapping area can be zero. So as to reduce a parasitic capacitance between the gate electrode of the second transistor T22 and the source electrode or the drain electrode of the second transistor 122.
In an embodiment, the second size is equal to 1.1 times the first size.
It should be noted that, the second size is configured to be equal to 1.1 times the first size in the embodiment, which can minimize the adverse effect on the potential of the output terminal of the second transistor T22 with an appropriate size. Not only the occupied space of the gate driving circuit is reduced, but also the stability of the gate driving circuit is improved.
In an embodiment, each of the gate driving units further includes a third transistor T21, a gate electrode of the third transistor T21 is connected to the another one of the source electrode and the drain electrode of the first transistor T11, one of a source electrode and a drain electrode of the third transistor T21 is connected to the second transmission line 13, and another one of the source electrode and the drain electrode of the third transistor T21 is connected to the cascade line 141 or the scan line 142. Wherein a third size of the third transistor T21 is greater than the first size of the first transistor T11.
It should be noted that, in the gate driving circuit, by setting the third size of the third transistor T21 to be greater than the first size of the first transistor T11, compared with the first size of the first transistor T11, the third size of the third transistor T21 is increased, which not only improves the working stability of the third transistor 121 itself, but also limits the transmission performance of the first transistor T11 through the first size, so as to reduce or avoid the coupling of the potential of the output terminal of the first transistor T11 to a potential of an output terminal of the third transistor T21. And it is beneficial to stabilize the potential of the output terminal of the third transistor, thereby improving the working stability or reliability of the gate driving circuit.
In an embodiment, the third size is greater than or equal to 1.05 times the first size, and is less than or equal to 1.25 times the first size.
It should be noted that, a proportional relationship is configured between the first size and the third size in the embodiment, which can minimize an adverse effect on a potential of an output terminal of the third transistor T21 with an appropriate size. Not only an occupied space of the gate driving circuit is reduced, but also the stability of the gate driving circuit is improved.
Wherein by increasing the third size of the third transistor T21, a positional relationship between the gate electrode and the output terminal of the third transistor T21 can be configured more flexibly, and the output terminal is the source electrode and the drain electrode. For example, a smaller overlapping area between the gate electrode of the third transistor T21 and the source electrode or the drain electrode of the third transistor T21 can be configured in a thickness direction of the gate driving circuit, and even the smaller overlapping area can be zero. So as to reduce a parasitic capacitance between the gate electrode of the third transistor T21 and the source electrode or the drain electrode of the third transistor T21.
In an embodiment, the third size is equal to 1.1 times the first size.
It should be noted that, the third size is configured to be equal to 1.1 times the first size in the embodiment, which can minimize the adverse effect on the potential of the output terminal of the third transistor T21 with an appropriate size. Not only the occupied space of the gate driving circuit is reduced, but also the stability of the gate driving circuit is improved.
In an embodiment, the another one of the source electrode and the drain electrode of the second transistor T22 is connected to the cascade line 141, the another one of the source electrode and the drain electrode of the third transistor T21 is connected to the scan line 142, and the third size is greater than the second size.
It should be noted that, compared with the second transistor T22, the third transistor T21 connected to the scan line 142 needs to go through a longer path for to output a corresponding scan signal to a display panel, and the third transistor T21 needs to drive more loads. Therefore, a configuration of the third transistor T21 with a greater size than a size of the second transistor T22 is also beneficial to improve a load-carrying capability of the scan signal output by the third transistor T21, which further stabilizes the working stability or the reliability of the display panel.
In an embodiment, the gate driving unit further includes a transistor T44. One of a source electrode and a drain electrode of the transistor T44 is connected to the another one of the source electrode and the drain electrode of the first transistor T11 and a first node Q(N), another one of the source electrode and the drain electrode of the transistor T44 is connected to a first low potential line, and a gate electrode of a transistor 32 is connected to a start line.
It should be noted that, the first low potential line is configured to transmit a first low potential signal VSSQ. The start line is configured to transmit a start signal STV, and the start signal STV can inhibit the gate driving circuit from providing an output signal with pulses in a blank period of each frame.
In an embodiment, the gate driving unit further includes a first inversion module, and the first inversion module is connected to the first node Q(N) and a second node K.
It should be noted that, in the embodiment, when a potential of the first node Q(N) is a high potential, a potential of the second node K is a low potential, and when the potential of the first node Q(N) is a low potential, the potential of the second node K is a high potential.
In an embodiment, the first inversion module includes a transistor T51, a transistor T52, a transistor T53, and a transistor T54. One of a source electrode and a drain electrode of the transistor T51 is connected to one of a source electrode and a drain electrode of the transistor T53, a second control line, and a gate electrode of the transistor T51. Another one of the source electrode and the drain electrode of the transistor T51 is connected to a gate electrode of the transistor T53 and one of a source electrode and a drain electrode of the transistor T52. Another one of the source electrode and the drain electrode of the transistor T53 is connected to the second node K, the gate electrode of the transistor 32, and one of a source electrode and a drain electrode of the transistor T54. The first low potential line is connected to another one of the source electrode and the drain electrode of the transistor T52, and another one of the source electrode and the drain electrode of the transistor T54. The first node Q(N) is connected to a gate electrode of the transistor T52 and a gate electrode of the transistor T54.
Wherein the second control line is configured to transmit a second control signal, and the second control signal is a low frequency control signal LC1.
In an embodiment, the gate driving unit further includes a transistor T42. One of a source electrode and a drain electrode of the transistor T42 is connected to the first node Q(N), another one of the source electrode and the drain electrode of the transistor T42 is connected to the first low potential line, and a gate electrode of the transistor T42 is connected to the second node K.
In an embodiment, the gate driving unit further includes a transistor T72. One of a source electrode and a drain electrode of the transistor T72 is connected to the another one of the source electrode and the drain electrode of the second transistor T22 and the cascade line 141, another one of the source electrode and the drain electrode of the transistor T72 is connected is connected to the first low potential line, a gate electrode of the transistor T72 is connected to the second node K.
In an embodiment, the gate driving unit further includes the transistor T32. One of a source electrode and a drain electrode of the transistor T32 is connected to the another one of the source electrode and the drain electrode of the third transistor T21 and the scan line 142, another one of the source electrode and the drain electrode of the transistor T32 is connected to a second low potential line, and the gate electrode of the transistor T32 is connected to the second node K.
It should be noted that, the second low potential line is configured to transmit a second low potential signal VSSG.
In an embodiment, the gate driving unit further includes a capacitor Cbt, one end of the capacitor Cbt is connected to the first node Q(N), and another one end of the capacitor Cbt is connected to the scan line 142.
In an embodiment, the gate driving unit further includes a second inversion module, and the second inversion module is connected to the first node Q(N) and a third node P.
It should be noted that, in the embodiment, when a potential of the first node Q(N) is a high potential, a potential of the third node P is a low potential, and when the potential of the first node Q(N) is a low potential, the potential of the third node P is a high potential.
In an embodiment, the second inversion module includes a transistor T61, a transistor T62, a transistor T63, and a transistor T64. One of a source electrode and a drain electrode of the transistor T61 is connected to one of a source electrode and a drain electrode of the transistor T63, a third control line, and a gate electrode of the transistor T61. Another one of the source electrode and the drain electrode of the transistor T61 is connected to a gate electrode of the transistor T63 and one of a source electrode and a drain electrode of the transistor T62. Another one of the source electrode and the drain electrode of the transistor T63 is connected to the third node P and one of a source electrode and a drain electrode of the transistor T64. The first low potential line is connected to another one of the source electrode and the drain electrode of the transistor T62 and another one of the source electrode and the drain electrode of the transistor T64. The first node Q(N) is connected to a gate electrode of the transistor T62 and a gate electrode of the transistor T64.
Wherein the third control line is configured to transmit a third control signal, and the third control signal is a low frequency control signal LC2. When a potential of the second control signal is a low potential, a potential of the third control signal is a high potential, and when the potential of the second control signal is a high potential, the potential of the third control signal is a low potential.
In an embodiment, the gate driving unit further includes a transistor T43. One of a source electrode and a drain electrode of the transistor T43 is connected to the first node Q(N), another one of the source electrode and the drain electrode of the transistor T43 is connected to the first low potential line, and a gate electrode of the transistor T43 is connected to the third node P.
In an embodiment, the gate driving unit further includes a transistor T73. One of a source electrode and a drain electrode of the transistor T73 is connected to the cascade line 141, another one of the source electrode and the drain electrode of the transistor 173 is connected to the first low potential line, and a gate electrode of the transistor T73 is connected to the third node P.
In an embodiment, the gate driving unit further includes a transistor T33. One of a source electrode and a drain electrode of the transistor T33 is connected to the scan line 142, another one of the source electrode and the drain electrode of the transistor T33 is connected to the second low potential line, and a gate electrode of the transistor T33 is connected to the third node P.
In an embodiment, the gate driving unit further includes a transistor T41. One of a source electrode and a drain electrode of the transistor T41 is connected to the first node Q(N), another one of the source electrode and the drain electrode of the transistor T41 is connected to the first low potential line, and a gate electrode of the transistor T41 is connected to a fourth control line.
It should be noted that, the fourth control line is configured to transmit a forth control signal, and the fourth control signal may be a N+8th level cascade signal ST(N+8).
In an embodiment, the gate driving unit further includes a transistor T31. One of a source electrode and a drain electrode of the transistor T31 is connected to the scan line 142, another one of the source electrode and the drain electrode of the transistor T31 is connected to the second low potential line, and a gate electrode of the transistor T31 is connected to the fourth control line.
In an embodiment, the above transistors may be N-channel thin film transistors. Specifically, the above transistors may be N-channel metal oxide thin film transistors. Preferably, the above transistors may be N-channel indium gallium zinc oxide thin film transistors.
In an embodiment, the above transistors may be P-channel thin film transistors. Specifically, the above transistors may be P-channel polysilicon thin film transistors. Preferably, the above transistors may be P-channel low temperature polysilicon thin film transistors.
Referring to
Wherein the output line 14 is configured to transmit an output signal, the output signal 14 includes a first potential and a second potential, the first potential is higher than the second potential, and a gate potential of the second transistor in a conduction state is higher than the first potential.
It should be noted that, after the size of the second transistor T22 is increased, even if a potential of the another one of the source electrode and the drain electrode of the first transistor T11 is much higher than the potential of the Nth level cascade signal ST(N), the second transistor T22 can maintain stable output without being affected.
In an embodiment, a display panel is provided, and the display panel includes the gate driving circuit in at least one of the embodiments.
It can be understood that, in the display panel of the embodiments, by setting the second size of the second transistor T22 to be greater than the first size of the first transistor T11, compared with the first size of the first transistor T11, the second size of the second transistor T22 is increased, which not only improves the working stability of the second transistor T22 itself, but also limits the transmission performance of the first transistor T11 through the first size, so as to reduce or avoid the coupling of a potential of an output terminal of the first transistor T11 to a potential of an output terminal of the second transistor T22. And it is beneficial to stabilize the potential of the output terminal of the second transistor T22, thereby improving the working stability or reliability of the gate driving circuit.
It should be noted that, the display panel may be a liquid crystal display panel, and the display panel may be a self-luminous display panel, such as an organic light-emitting display panel, a mini light-emitting display panel, or a quantum dot light-emitting display panel.
In the foregoing embodiments, the description of each of the embodiments has respective focuses. For a part that is not described in detail in an embodiment, reference may be made to relevant descriptions in other embodiments.
The gate driving circuit and the display panel of the present disclosure are described in detail above. The principle and implementations of the present disclosure are described in this specification by using specific examples. The description about the foregoing embodiments is merely provided to help understand the method and core ideas of the present disclosure. Persons of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features thereof, without departing from the scope of the technical solutions of the embodiments of the present disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202211237916 | Oct 2022 | CN | national |
